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首页> 外文期刊>Ground Water Monitoring & Remediation >Thermal Treatment of Eight CVOC Source Zones to Near Nondetect Concentrations
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Thermal Treatment of Eight CVOC Source Zones to Near Nondetect Concentrations

机译：八个CVOC源区的热处理达到接近未检测到的浓度

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In situ thermal desorption (ISTD) was used for the treatment of eight separate source zones containing chlorinated solvents in a tight loess (silt/clay) above the water table. The source areas were as much as 365 m (1200 feet) apart. A target volume of 38,200 m~3 (49,950 cubic yards) of subsurface material to a depth of 9.1 m (30 feet) was treated in a period of 177 days. Energy was delivered through 367 thermal conduction heater borings, and vapors were extracted from 68 vertical vacuum wells. A vapor extraction and capture system, including a surface cover and vertical vacuum wells next to heater borings, provided for effective pneumatic control and capture of the chlorinated volatile organic compound (CVOC) vapors. A central treatment system, based on condensation and granular activated carbon filtration, was used to treat the vapors. Approximately 5675 kg (12,500 pounds) of contaminants was recovered in the extracted vapors. Forty-seven soil samples were used to document remedial performance. Based on these, the concentrations of the target contaminants were reduced to below the target remedial goals in all eight areas, typically with concentrations below 0.01 mg/kg in locations that had had CVOC concentrations higher than 1000 mg/kg. Turn-key costs for the thermal remediation were $3.9 million, and the unit treatment cost, including all utilities, was $103 per cubic meter treated ($79 per cubic yard).
机译：原位热脱附（ISTD）用于处理地下水位上方密实黄土（淤泥/粘土）中的八个单独的含氯溶剂的源区。源区域相隔最多365 m（1200英尺）。在177天的时间内处理了目标体积为38,200 m〜3（49,950立方码）的地下材料，深度为9.1 m（30英尺）。能量通过367个导热加热器钻孔传递，蒸气从68个垂直真空井中抽出。蒸气提取和捕集系统，包括表面覆盖层和加热器钻孔旁边的垂直真空井，用于有效地气动控制和捕集氯化挥发性有机化合物（CVOC）蒸气。基于冷凝和颗粒活性炭过滤的中央处理系统用于处理蒸气。在提取的蒸气中回收了大约5675千克（12,500磅）的污染物。使用47个土壤样品来记录修复性能。基于这些，在所有八个区域中目标污染物的浓度均降低到目标补救目标以下，通常在CVOC浓度高于1000 mg / kg的地区，目标污染物的浓度低于0.01 mg / kg。热修复的总成本为390万美元，包括所有公用事业在内的单位处理成本为每立方米处理103美元（每立方码79美元）。

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